Answer: The two terminals of the electric cell are never joined together without connecting them through a switch and a device like a bulb because if we do so the chemicals in the electric cell get used up very fast and the cell stops working.
What happens if you join two terminals of a cell directly?
The electric cell produces electricity from the chemicals stored inside it. ... We should never join the two terminals of a cell directly by a wire because if we join the two terminals of a cell directly by wire only, then the chemicals present in the cell get used up very fast, the cell gets damaged quickly .
What happens if two terminals of the cell is connected to a wire without connecting an appliance in a circuit?
Because if you connect both terminals without “an appliance” in between them to form a circuit, then the cell will produce the highest electrical current which it can provide and such uncontrolled release of energy may cause either the cell to overheat, or the wire you use to connect cell's terminals to overheat.
What will happen if you connect both the ends of connecting wires to the same terminal of a cell in a simple electric circuit?
The bulb will glow only if the wire connecting it and the two terminals forms a complete loop. ... If both the terminals of the bulb are connected to the same terminal of the cell, then the bulb will not glow , as in figure (c).
Why are there two terminals in an electric cell?
An electric cell has two terminals, one positive and one negative because of which the current cannot pass through one side . ... When an electric cell is connected to a circuit, electrons flow away from the negative terminal in the circuit but within the cell, electrons flow towards the negative terminal.
Why we should not join the two terminals?
The two terminals of the electric cell are never joined together without connecting them through a switch and a device like a bulb because if we do so the chemicals in the electric cell get used up very fast and the cell stops working .
What will happen if we increase the number of cells in the given electric torch?
Placing cells in series increases the voltage in the circuit by 1.5 V for each cell. Increasing the voltage increases the brightness of the bulb. When a bulb in a series circuit is unscrewed all bulbs in the circuit go out. Increasing the number of bulbs in a series circuit decreases the brightness of the bulbs.
What happens when a wire is connected to a cell?
When the ends of the wire are connected to a cell, the electrons start moving from the negative terminal of the cell to its positive terminal through the metal wire . During their movement, they collide with the free electrons and fixed ions of the wire. This causes them to lose their speed and change their direction.
Why do bulbs have two terminals Class 6?
Why do bulbs have these two terminals? The bulbs have two terminals because, a circuit can be completed only when there are both the positive terminal as well as the negative terminal, as the current flow is allowed only when the circuit is complete . Hence, the bulb has two terminals.
What are the two terminals of cell?
All electrochemical cells have two terminals, referred to as the anode and cathode or positive (+) and negative (-) .
Which allows electricity to pass through it?
Materials that allow electricity to pass through them are called conductors . Copper wire is a good conductor. Materials that do not allow electricity to pass through them are called insulators. Plastic is a good insulator.
What are the causes of fire in electric circuit class 7?
- faulty outlets,appliances.
- light fixtures .
- Extension cords.
- Space heaters.
- Wiring.
What happens if you connect both wires to the same end of the battery?
If you connect a wire between the two terminals, the electrons will flow from the negative end to the positive end as fast as they can . This will quickly wear out the battery and can also be dangerous, particularly on larger batteries.
What is used to break an electric circuit?
Solution: (a) A device that is used to break an electric circuit is called a switch .
What are two main conditions necessary to make the bulb glow in an electric circuit?
(i) There should be an electrical source, i.e., one or more electric cells connected to a circuit . (ii) There should not be any gaps or discontinuity in the wires connected to the circuit. (iii) The switch connected to the circuit should be kept closed.
What happens when both positive and negative terminals of a cell are connected to the same terminal of a bulb?
Answer: electric circuit , the direction of current is taken to be from the positive to the negative terminal of the electric cell as shown in Fig. ... When the terminals of the bulb are connected with that of the electric cell by wires, the current passes through the filament of the bulb. This makes the bulb glow.
